KENNETT SQUARE, PennsylvaniaTwo hundred supporters of immigrant rights marched here in the town and countryside May 1, including local mushroom workers, the majority of whom are from Mexico. The march was sponsored by the Kaolin Workers Union (KWU) and El Comité de Apoyo a los Trabajadores Agricolas, a farm worker support committee. Workers represented by KWU are fighting for a contract with yearly wage increases and a clause that requires contract workers to join the union after 60 days. Speakers included Walter Hudson, organizer of an upcoming march on May 15 in nearby Penns Grove, New Jersey, against the police killing in March of Moshowon Leach, a Black worker.